Neuroanatomy

Question 1

What spinal segments do the Femoral nerve come from?

Answer 1

L4-L6

Question 2

What spinal segments do the Sciatic nerve come from?

Answer 2

L6-S2

Question 3

What spinal segments do the Pudendal nerve come from?

Answer 3

S1-S3

Question 4

What spinal segments do the Musculocutaneous come from?

Answer 4

C6-C8

Question 5

What spinal segments do the Radial nerve come from?

Answer 5

C7-T2

Question 6

What nerve is the Biceps reflex mediated by?

Answer 6

Musculocutaneous

Question 7

What nerve is the Triceps reflex mediated by?

Answer 7

Radial

Question 8

What nerve is the Etensor Carpi Radialis reflex mediated by?

Answer 8

Radial

Question 9

What nerve(s) mediate the Thoracic Limb Withdrawal Reflex?

Answer 9

Axillary, Musculocutaneous, Median, Ulnar

Question 10

What nerve mediates the Patellar Reflex?

Answer 10

Femoral

Question 11

What nerve mediates the Gastrocnemius Reflex?

Answer 11

Sciatic

Question 12

What nerve mediates the Cranial Tibial Reflex?

Answer 12

Sciatic

Question 13

What nerve mediates the Perineal Reflex?

Answer 13

Pudendal

Question 14

What nerve mediates the Pelvic Limb Withdrawal Reflex?

Answer 14

Femoral and sciatic

Question 15

What are the 7 regions of the nervous system assessed by neurologic exams?

Answer 15

1. Motor Unit
2. Spinal Cord
3. Pons and Medulla
4. Cerebellum
5. Midbrain
6. Hypothalamus and Thalamus
7. Cerebrum

Question 16

What makes up the motor unit?

Answer 16

Sensory Nerves (Afferent)
Ventral Horn Cell
Peripheral Nerve (Efferent)
Neuromuscular Junction
Skeletal Muscle

Question 17

What is a spinal reflex?

Answer 17

Involuntary response to mechanical stimulation, independent of the CNS.
It is influenced by UMN and unconscious.

Question 18

Signs of Motor Unit disease/LMN signs

Answer 18

Loss of spinal reflexes
Loss of motor function
Loss of sensation (not always, only if sensory nerves damaged)
RAPID loss of muscle bulk and tone